﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace wimImageCut
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string oldDirFile = @"H:\ABP\jbh1";
            string newDirFile = @"H:\ABP\jbh";
            DirectoryInfo theFolder = new DirectoryInfo(oldDirFile);
            DirectoryInfo[] dirInfo = theFolder.GetDirectories();
            string fileName = string.Empty;
            string er = "";
            //遍历文件夹
            //foreach (DirectoryInfo NextFolder in dirInfo)
            //{
                // this.listBox1.Items.Add(NextFolder.Name);
                FileInfo[] fileInfo = theFolder.GetFiles();
                foreach (FileInfo NextFile in fileInfo)  //遍历文件
                {
                    try
                    {
                        fileName = NextFile.Name;
                        MakeThumbnail(oldDirFile + "\\" + fileName, newDirFile + "\\" + fileName, 0, 0, "");
                    }
                    catch(Exception ex) {
                        er = ex.Message.ToString();
                    }
                }
            //}

            label1.Text = "OK"+er.ToString();
        }
        /**//// <summary> 
            /// 生成缩略图 
            /// </summary> 
            /// <param name="originalImagePath">源图路径（物理路径）</param> 
            /// <param name="thumbnailPath">缩略图路径（物理路径）</param> 
            /// <param name="width">缩略图宽度</param> 
            /// <param name="height">缩略图高度</param> 
            /// <param name="mode">生成缩略图的方式</param>     
        public void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            Image originalImage = Image.FromFile(originalImagePath);

            int towidth = originalImage.Width;
            int toheight = originalImage.Height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）                 
                    break;
                case "W"://指定宽，高按比例                     
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例 
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                 
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片 
            Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板 
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法 
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度 
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充 
            g.Clear(Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分 
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
                new Rectangle(x, y, ow, oh),
                GraphicsUnit.Pixel);

            try
            {
                //以jpg格式保存缩略图 
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }

    }
}
